Vise



c. s. EVANS.

VISE.

APPLICATION FILED FEB. 16. 1916,

' Patentefl July 27, 1920.

2 SHEETS-SHEET l.

a v M 2 I llllVf/YTOR C. S. EVANS.

VISE.

APPLlCATiON FILED FEB.-I6. 1915 1,347,623. Patent d July 27, 1920.

2 SHEETS-SHEET 2.

INVENTOR UNITED STATES CHARLES SUMNER EVANS, 0F BERKELEY, CALIFORNIA.

VISE.

Specification of Letters Patent.

Patented July 27,1920.

Application filed February 16, 1916. Serial No. 78,659.

T 0 all whonm't may concern:

Be it known that E, CHAnLn's SUMNER Evans, a citizen of the United States, and a resident of Berkeley, county of Alameda, State of California, have invented certain new and useful Improvements in Vises, of which the following is a specification.

The invention relates to Vises and particularly to the class known as quick or rapid action vises.

An object of the invention is to provide a vise which combines with a continuous so ew action in either direction, a quick adjustment of the movable jaw at any point in the turn of the screw.

Another object of the invention is to provi de a vise in which the locking of the screw in engagement with the nut occurs simultaneously with the gripping of an article by the jaws of the vise and in which the relaxing of the pressure between the jaws unlocks but does not disengage the screw from the nut so that a quick adjustment, or a screw adjustment of the front jaw may be had.

Another object of the invention is to provide a quick action vise in which the pressures developed between certain members of the vise during its use are utilized to lock the screw in engagement with the nut.

Another object of the invention is to provide a quick action vise in which the engagement and disengagement of the screw with the nut is positive and effected by simple and direct means. A further object of the invention is to provide a vise of the class described which is simple in mechanism. inexpensive to manufacture and of great durability.

The invention possesses other advantageous features. some of which with the foregoing, will be set forth at length'in the following description, where I shall fully explain that preferred form of my invention which is illustrated in the drawings accompanyingand forming part of the specification. The n velty of the invention will be included in the claims succeeding the said description. It is understood that I do not limit myself to the showing made by the said drawings and description. as I may adopt many variations within the scope of my invention. as set forth in the said claims.

Referring to the drawings:

Figure l is a plan or top view of the vise of my lnvention, portions being broken away to reduce the length of the figure and show the construction.

2 is a front elevation of the vise, the handle and screw head being omitted.

Fig. 3 is an elevation of the main frame.

7 A portion of the front wall is broken away .to show the nut.

Fig. 4; is a horizontal cross section of the front aw taken on the line M, Fig. '2.

Fig. 5 1s an elevation of the inside of the front jaw of the vise, taken on the line 5'5, Fig. 1 and showing the automatic 'w ith the nut.

Fig. 9 is a sectional view similar to that or Big. 4, but showlng the front jaw when made wlth one dog instead of two.

Fig. 10 is a 'side view of a modified form of jaw dog. 7 I

Fig. 11 is a top view of the same dog,

Fig. 12 is a fragmentary top view ofa modified form of front jaw and screw head.

Fig. 13 is an elevation on a reduced scale of a modification of the main frame. A portion of the front wall is broken away to s yw the construction. v

i k. 14 is an elevation of the inside of the front jaw of the same modification.

Fig. 15 is a plan or top View of a modified form of vise.

Fig. 16 is a vertical section through the main frame taken on the line 1616 of Fig. 15 and showing the screw in engagement with the nut. I

F 17 is a. similar view showing the screw raised out of the nut to its quick action posltion. I

Fig. 18 is a perspective viewof the rider used in the modification illustrated in Fig. 15.

In the vise of my invention the screw is arranged to shift transversely, maintaining its parallelism, into and out of engagement with the nut. When in engagement with the nut, & l l g Of the 303% Operates to close I or open the jaws.

After the screw is shifted transversely out of engagement with the nut, the front jaw may be moved freely in or out to the desired position, when the-screw may be shifted transversely back into engagement with the nut so that the jaw is again operated by the turning of the screw! Whenever the term transversevis used in the specification to define the movement of the screw into and out of the nut, I desire it to be understood to mean a movement of i the screw bodily at right angles to its longitudinal axis, the screw during such move eratingparts and adapted to be fastened to the under side of a bench top in the usual manner by screws passing through the extensions 3 and 4 of the frameyand the front of the main frame is preferably extended upwardly'to form the rear or stationary jaw 5 of the vise. The front or movable-jaw 6 of the vise,'is supported on slides 7 and 8 which pass through apertures 11 and 12 respectively in the walls of its longitudinal axis in the front the main frame which are bossed about the apertures to glve increased bearing surface to the slides. The front aw 6 and the slides 7 and 8 constitute the slidable or movable frame. The slide 7 is rigidly secured in'any suitable manner to the front jaw 6, 'but the slide 8 is journaled in the front jaw at 13 and is oscillatable or partially revoluble therein about its'longitudinal axis.

Preferably acollar 1t'is sprung or otherwise fastened into a shallow groove cut in the slide 8 so that a bearing is formed on the slide on the inside of the jaw; or instead, the journal 13 may be reduced in size so that the slide presents a shoulder to the jaw at thispoint. I

Means are provided for carrying the actuating screw ofthe vise on the pivoted slide. Rigidly secured in any suitable manner to the front endof the slide 8, is the link 15, and a link 16 of the. samelength between centers and axially parallel to the 'link 15 is rigidly but preferably removably attached to therear end of the slide 8. The end: of the slide is preferably tapered in the form of a pyramid to it a similarly shaped aperture in the link, and a niit l'? threaded on the end of'the slide to maintain the link securely in place. The movable frame is therefore slidable back and forth in the main frame, the slide 8 being also capable of independent rotary or pivotal motion about jaw and main frame. I

'Journaledin the links 15 and 16 and parallel to the slide 8 is the scr'ewlS. The

rear end 19 of the screw is preferably journaled full size or slightly larger than the gated aperture 24 in the front jaw.

diameter of the threaded portion, in the parts, and the front end 21 is reduced in diameter so that a shoulder 22 is formed to V abut against the washer. or rider 23 which in turn bears against the edges of the e llenhe purpose of the rider 23 is to prevent a forward longitudinal displacement of the screw with respect to the front jaw and also to lock the screw in the nut when the screw is turned to open the front aw as w1ll be explained presently.

A head 25 is rigidly but removably secured by any suitable means, such as the pin 26, on the front end 21 of the screw on the outside of the link 15.' The screw head elongated apertures 28 and29 in the front and rear walls of the main frame. It will be understood from the above that the screw 18 is securely held by, but freely revolves in, its bearings in the links 15 and 16 and that it is movable transversely in a limited are about the axis of the slide 8 as a center, the slide 8 turning or pivoting in its bearings in the front jaw and main frame with each transverse shifting of the screw. The structure formed by the slide 8 and the links 15 and 16 is in effect an integral one and its function is to rcvolubly support the screw and permit it to be shifted transversely. The slide 8 also possesses functions as a part of the slidable frame, since it is one of the two supporting slides in the frame.

Located in the main frame 2 below the screw 18'and alined therewith is a nut 31 which may be formed separately and se cured in the frame or be formed integral with the main frame as shown in Figs. 1 and 3. The'position of the nut issuch that when the screw is in its lower position, the threads of the screw are in engagement with the threads vof the nut and rotation of the screw causes a movement of the slidable frame. Preferably the nut is formed with a slot 32 3) dividing it longitudinally. This slot facilitates the working out of dirt link 16 to facilitate the assembling of the A handle 27 of or other foreign matter which may be car- I ried'into the nut accidentally.

Upon exerting an upward lateral pressure on the screw head 25, thescrew- 18 is shifted transversely, the structure formed by the slide '8 and the links 15 and 16 turning in its bearings in the front jaw and main frame. The transverse motion of the screw may be about one-half inch and when it has moved that distance and its axis lies in the plane of the axes of the slides 7 and 8, it has disengaged from the nut and the slidable frame may then be moved freely in or out. Preferably the upward motion of the screw is limited by striking the top of the elongated aperture 2% in the front jaw, and the motion downward is preferably limited by the screw engaging the nut and at the same time encountering the bottom of the aperture 2t so that any tendency to rack the pivoted frame carrying the screw is avoided. It is thus seen that by raising the screw head a small amount, the screw is disengaged from the nut and by dropping it back again, it engages the nut. If the threads of the screw and nut do not immediately mesh when the screw is dropped, they do so as soon as the screw is turned. In Fig. 3 the dotted circle 18 indicates the position of the screw 18 when it has been shifted transversely out of engagement with the nut 31. Since the screw shifts transversely about the axis of the slide 8 and since in its position in the nut, its center lies in a plane below that of the slide 8, it follows that if a nut is to engage a full one-half of the circumference of the screw, as it is preferable to do, one side of the nut must be raised and one side lowered from the horizontal plane passing through the center of the screw. This is shown in Fig. 3 and substantially amounts to a tipping to the side of the nut that the shifting screw engages and disengages it without binding on its sides. The amount of the tipping is determined by a line XY drawn through the center of the pivoted slide and the center of the nut, this line being normal to the arc of travel of the axis of the screw as it shifts transversely.

Means'are provided for locking the screw in the nut when a piece is clamped in the vise. Preferably the pressures developed between members in the vise when pressure is applied to a piece held in the jaws are made use of for this purpose. Pressures which lend themselves readily to this use are developed between the nut and the main frame if they are formed separately, and also between the screw head and front aw, and also between the oscillatable or pivoted slide and the front jaw. In the construction which I am now describing, that is, that shown in Fig. l, I make use of both of the last two of these pressures to hold the screw securely in engagement with the nut when a piece is being clamped in the vise. Assuming the screw turning in the nut to clamp a piece between the jaws; it is apparent that as soon as pressure is applied to the piece, the front jaw tends to tip on the slides in a direction toward the opera tor. This creates a high pressure between the slide journal 13 and its bearing in the front jaw, thus preventing any movement of the slide in its bearing and consequently preventing the 'aising of the screw. During the turning of the screw to clamp a piece between the jaws, a pressure equal to that developed between the jaws is exerted between the contacting faces of the screw head 25, the link 15 and the contact surface on the jaw 6; thatis to say, the link 15 is pressed by a screw head against the contact surface with the full power of the screw turning in the nut. The contact surface 33 is formed upon the front of the jaw surrounding the aperture therein through which the front end of the screw passes. Its function is to provide a bearing surface against which the contiguous face of the link 15 seats. Obviously the screw cannot rise unless the link rises, and the link is immovable under the pressure which clamps it against the jaw. Thus a powerful and absolutely certain locking means is provided which is entirely automatic inv its action and which operates simultaneously with and in proportion to any pressure exerted between the jaws. Releasing the grip of the jaws on the piece also releases the pressure on the link 15 and between the slide journal and its bearing so that quick action of the front jaw is available simultaneously with the release of the grip of the jaws. In precisely the same way the rider 23 lying between the shoulder on the screw and the inside surface of the jaw locks the screw in the nut when it is turned to open the jaws of the vise. t is frequently desired to hold a hollow article in the dogs by pressure tending to separate the jaws and the rider 23 is effective in locking the screw in the nut during such use.

Means are also provided for holding the screw out of engagement with the nut. The inside of the front jaw is formed preferably with a recess 34:, Fig. 5, sufficiently deep to accommodate-the automatic catch 35, pivotally mounted on the pin 36 which is so placed that a line passing through the center of the pin and the center of gravity of the catch when the latter hangs free, lies approximately in the vertical plane through the center of the screw; that is, when the vise is mounted in position on a bench, the weight of the catch tends to cause it to swing to the left of the position shownin Fig. 5.

The position of the pin 36 and the shape of" the catch are such that when the screw is in the lower position engaging the nut as shown in Fig. 5, the catch is inoperative, the point 37 of the hook merely bearing against the screw as it turns, but in noway affecting its operation. When the screw is raised for quick action of the jaw, the catch falls to the left (Fig. 6) under the screw and the heck of the catch supports the screw in the elevated position. At; the portion engaged by the catch, the screw is provided with a longitudinal shallow groove 38 having a sub-- screw and releasing it.

stantially radial side 39. The hook of the catch is so formed that the weight of the screw is supported near its end, the edge 41 being preferably straight or nearly so. When it is desired to release the screw from the catch so that it may engage the nut (the parts being as in Fig. 6) the screw is turned as if to'clamp the jaws of the vise. The screw rotates in the hook of the catch until the point 3'? enters the groove 38 and engages the radial side 39 when, the rotation continuing, the catch is forced to the right until the screw drops off of the hook and engages the threads of the'nut either directly or following a fraction of a turn, the parts being then as shown in Fig. 5. Two or more grooves may be cut in the screw but even with one, it is seldom that more than one turn of the screw is needed to release the screw from the catch,engage the nut and clamp the piece. As will be understood from the above, the operation of the catch is entirely automatic, both in engaging the The catch 85 is preferably flat and of substantially rectangular cross section and conveniently be formed of the same thickness throughout. The requisite qualities are suflicient strength in the curve of the hook and suflicient bearing surface about the pin 36 and on the edge 41.

The front jaw of the vise may be made plain or it may be provided with one or two dogs. Fig. 2 shows the front jaw when provided with two of my improved dogs. A third dog, Fig. 7, of similar shape is adapted to be held in holes in the top of the bench in a well known manner, so that a threepoint contact for circular or irregular pieces i provided. The dogs in the front jaw are vertically and revolubly adjustable and each consists of a head 43 preferably of the half round shape shown and a shank 44 having a reduced portion 45 intermediate its ends.

The dogs are mounted in the jaw, their shanks seating in sockets formed in the ver tically disposed thickened portions 46. Formed in the inside face of the jaw is a long narrow recess 47 which deepens on both sides of a vertical center line until it runs into the sockets so that the shank of the dog in each socket traverses the recess. A flat spring 48 bent in the middle is disposed in the recess so that its ends engage the re duced portions of the shanks as shown in Fig. 4. The spring 48 is flattened out somewhat and thereby placed in tensionby the wooden lining 49 which is secured to the inside of the jaw by screws 51. The spring bearing against the reduced portions of the shanks permits the dogs to be revolved to present the desired edge to the piece to be held, and to accommodate themselves to the shape of irregularly formed pieces; and also holds them in any vertical adjustment in advisable to core a small opening 55 near which they are placed. By reason of the springs engagement with the bottom flange 52, the dog is prevented from being withdrawn from its socket. It is to be noted that no tools of any sort are needed to adjust the dogs. The fingers alone are sufficient to set them to any desired position. I

A single dog may be arranged in the jaw in a similar way as shown in Fig. 9.. In this case the spring bears at its middle portion against the dog shank and at its ends against the wooden lining 49. The dog shank may be made like the shank 44 of Fig. 2 with a reduced portion so that the spring retains it in the socket or it may be left as shown in Fig. 10 so that while the spring holds the dog in revoluble and vertical adjustment in the socket, it may be withdrawn therefrom; In such a case I find it the bottom of the socket to facilitate cleaning it of dirt which may accumulate there.

In Figs. 15, 16 and 17 I have shown a modification of my invention in which the screw is locked into the nut by pressure exerted between the nut and the main frame, which in this case are separately formed, the nut 31 resting astride a cross brace 56 joining the bottommost edges of the front and rear walls of the frame. Extensions 57 on the sides of the nut are pierced with holes 58 through which a wire 59 is passed under. the brace 56, thus holding the nut down upon the brace, but not preventing a very slight longitudinal movement. Any other suitable means may be used to secure the nut upon the brace and prevent its lateral displacement. but however it is done the nut should be left free to move longitudinally a very small amount. A rider 65 is assembled on the screw 18 between the nut and the wall of the main frame so that when the screw is turned to grip a piece in the jaws of the vise, the rider is squeezed betweenthe nut and the frame, holding it im- 11o movable and preventingany shifting movement of the screw which it encircles. The hole in the rider is of such size that the screw slides and turns readily in it, but

without appreciable play therein. The rider is made wider than the pitch of the threads on the screw and the edges of the hole 66 are beveled a small amount so that the screw will slip through the hole easily without tendency to catch or bind. In order to prevent a tipping of the rider and consequent binding on the screw during the quick adjustment of the front jaw, the rider is exter'ided downwardly in two legs 67 one lying on each side of the cross brace 56; and the front of the nut 31 is provided with extensions 68 on each side of the screw to form a bearing surface for the rider. It will be clear from this that the rider moves up and down with the shifting of the screw,

but offers no appreciable resistance to its longitudinal movement or rotation.

in thls construction the link 15 hes on the inside of the jaw, preferably in a cored recess, and the rider 23 lies between the screw head 25 and the aw; that is, their positions are reversed or alternated from those shown in ig. 1. In this case the functions are also alternated, the link 15 looking the screw in the nut when the screw is turned to open the jaws, and the rider 23 locking the screw in the nut when it is turnedto close the jaws, thus supplementing the locking action of the rider 65 and the binding of the slide journal previously explained. From the above it will be clear that if desired the slidable frame shown in Fig. 15 may be assembled in the main frame and integral nut shown in Fig. 1, the locking of the screw being accomplished in a manner similar to that explained in connection with Fig. 1.

lVhen the rider 23 is assembled between the screw head and jaw it serves a useful purpose beside the one of locking the screw in the nut. hen the screw is turned to close the jaws, the rotation of the head against the contact surface 33 has a slight tendency to displace the screw unless the contact surface is lowered on one side, which is undesirable, since the pressure is all on one side of the screw head in that case. Interposing the rider 23 or the link 15 between the screw head and the contact surface completely obviates this tendency.

. In Fig. 15 the front jaw 6 is shown plain, that is, without dogs, the ribs 69 helping to make the jaw rigid. The catch 35 is here shown lying against the face of the aw instead of in a cored recess, the recess being in the lining 19. Then the link 15 ismounted on the inside of the front jaw, a washer 71 is preferably secured on the end of the slide 8 to retain it in its bearing in the jaw, but it is apparent that either in the construction shown in Fig. 1 or in that of Fig. 15, the link 15 which is rigidly secured to the slide 8 and which is definitely positioned in the front aw by the shoulder 22 of the screw on one side and the screw head 25- on the other, is suiiieient to maintain the journal 13 in'its bearing in the front jaw and for this reason I may journal the slide in the front jaw without the collar 141 or the washer 71, but with only the link on one side.

For the screw and nut I prefer to use a square thread or a modified square thread as at 72, Fig. 8, cutting the threads of the screw a little narrower than the spaces between them so that they separate from the threads of the nut in a transverse direction without binding.

In Fig. 12 I have shown another means of locking the screw in the nut. The screw head 25 is formed with the end 25 adapted to seat in a similarly formed depression in the front jaw when the screw isturned in the nut. A turn of the screw to open the jaws moves the screw head out of engagement with the jaw into the position shown in Fig. 12. The construction of the vise is otherwise the same or similar to that shown in Fig. 1. In my United States Patent 1111,2217 issued to me June 1, 1915, I have set forth a cushion grip spring which is arranged between the slidable frame and the main frame, or, what amounts to the same thing, between any two parts of the vise which may be put in opposition during the clamping of the jaws so as to produce the novel results there described. The construction shown in Fig. 12 is particularly adapted for the inclusion of the cushion grip spring, it preferably being located between the rear link and a shoulder on the screw in this instance as shown at 73. An examination of my prior patent aforesaid will disclose the-manner in which the cushion grip spring may be incorporated with either of the constructions shown in Figs. 1 and15. Preferably it would be disposed be tween the screw head 25 and the link 15 in the construction shown in Fig. 1 and between the nut 31 and the main frame wall in the construction shown in Fig. 15, but it may be inserted wherever mechanically convenieift between parts between -whiclr pressure is created by the turning of the screw in the nut to bring the jaws of the slidable and main frames'togetherQ The similarity of location of the locking rider iand the cushion grip spring may be noted iere.

In Figs. 13 and 14 I have shown a modification of my vise which differs from the others chiefly in the fact that the nut is above the screw instead of below it, and the screw is lowered to disengage the nut instead of raised. The screw is normally retained in its upper position by a suitably arranged spring 75 attached to the link 15 and a relatively fixed portion 76 of the vise. The automatic catch is arranged to take the thrust of the spring-drawn screw and hold it in its lower or disengaged position. In short, the construction shown in these figures is an inversion of the construction first explained with'the addition of the spring 75 to take the place of the force of gravity in engaging the screw with the nut. The particular advantage of the inverted type of construction lies in the fact that it practically precludes the possibility offoreign matter getting into the nut.

From the above it will be apparent that a slide pivotally mounted in the front jaw is possessed of peculiar value. The pivotal mounting does not interfere in any way with the function of the slide as such, and in addition it provides a means for trans mitting motion from the exposed front of the jaw into or through the vise structure for the purpose of operating mechanism there. In the present instance, the motion of the head 25 is transmitted by the slide to the rear end of the screw, so that both ends move together. It is contemplated that such combination of movable jaw and slide journaled therein will find application in mechanisms other than those described herein for transmitting motion to parts which it is desired to control from the front or eX- posed portion of the vise.

I claim: I

1. In a vise, a movable jaw and a slide attached to said jaw and pivotally movable therein about the longitudinal axis of said slide. V

2. In a vise, a movable jaw, slides attached to said jaw, and a transversely movable screw carried on one of said slides.

3. In a vise, a movable jaw, a fixed slide and a pivoted slide in said jaw, and a transversely movable screw supported on said pivoted slide.

4. In a vise, a movable jaw, slides 'attached to said jaw, links secured to one of said slides, and a screw supported in said to said pivoted slide, a screw carried by said links and a locking rider carried by said screw.

7. In a vise, a movable frame including a fixed slide anda pivoted slide, links securedto said pivoted slide and a screw rotatably mounted in said links and adapted to-be shifted transversely about the axis of said pivoted slide. 7

8. In avise, a main frame, a movable frame including a pivoted slide bearing in said main frame, and a screw supported on said slide andadapted to be shifted transversely. V I

9. In a vise, a main frame, a nut in said frame, a movable frame including a pivoted slide arranged in said main frame, and a screw supported on said pivoted slide and adaptedto be shifted transversely into and out of engagement with said nut.

10. In a vise,'a main frame, a nut in said frame, a movable frame including a pivoted slide arranged in said mainframe, a screw adapted to be shifted transversely into and out of engagement with said nut supported on said pivoted slide, and means for locking frame, a movable frame includlng a pivoted saidscrew in engagement with said nut.

.11. In a vise, a main frame, a nut in said frame, a movableframe including a pivoted slide arranged in said main frame, a screw a'daptedto be shifted transversely into and out of engagement with said nut supported on said pivoted slide, and means for holding said screw out of engagement with said nut.

12. In a vise, a main frame, aunt in said frame, a movable frame including a pivoted slide arranged in said main frame, a screw adapted to be shifted transversely into and out of engagement with said nut supported onsaid pivoted slide, means for holding said screw out of engagement with said nut, and means for releasing said screw from said holding means.

13. In a vise, a main frame, a nut in said frame, a movable frame arranged in said main frame, a pivoted slide forming part of said movable frame, links attached to said pivoted slide and a screw supported in said links and adapted to be moved transversely into and out of engagement with said nut.

14. In a vise, a main frame, a nut in said frame, a movable frame arranged in said main frame, a pivoted slide forming part of said movable frame, links attached to said pivoted slide, a screw supported in said links and adapted to be moved transversely into and out of said nut, and means including one of said links for locking said screw in said nut. r

15. In a vise, a main frame, a nut in said frame, a movable frameincluding a pivoted slide arranged in said main frame, links on said pivoted slide, a screw'revolubly carried by said links and adapted to be moved transversely into and outof said nut and means for locking said screw in engagement with said nut.

16. In a vise, a main frame, a nut in said frame, a movable frame including a pivoted slide arranged in saidmain frame, a screw adapted to be moved transversely into and out of said nut supported on said. pivoted slide and a rider on said screw.

17. In a vise, a main frame, a nut in said frame, a movable frame including a pivoted slide arranged in said main frame, a screw adapted to be moved transversely into and out of engagement with said nut supported on said pivotedslide, and means including a rider on said screw for locking said screw in engagement with said nut.

18. In a vise, a main frame, a nut in said frame, a movable frame including a jaw and a slide pivotally mounted in said jaw, and a screw adapted to be moved transversely into and out of said nut supported on said pivoted slide, the pinching of said jaw on said slide serving to lock said screw in engagement with said nut.

'19. Ina vise, a main frame, a nut in said slide arranged in said main frame, a screw supported on said pivoted slide and adapted to be moved transversely into and out of said nut, and locking means on said screw arranged between opposed portions of said vise.

20. In a vise, a main frame, a nut in said frame, a movable frame including a pivoted slide arranged in said main frame, a screw supported on said pivoted slide and adapted to be moved transversely into and out of engagement with said nut and a rider on said screw arranged to be pressed between portions of said vise when said screw' is turned in said nut.

21. In a vise, a main frame, a nut in said frame, a movable frame including a pivoted slide arranged in said main frame, a screw supported on said pivoted slide and adapted to be moved into and out of said nut, and means for locking the screw in said nut arranged between opposed portions of said vise.

22. In a vise, a main frame, a nut in said frame, a movable frame including a jaw and a slide pivoted in said jaw, links attached to said pivoted slide, and a screw adapted to engage the nut supported in said links, one of said links being arranged so that it is clamped against said jaw when the screw is turned in said nut.

23. In a vise, a main frame, a nut in said frame, a movable frame including a jaw and a slide pivoted in said jaw, a screw sup ported on said pivoted slide and adapted to be moved transversely into and out of said nut, and a rider on said screw arranged to be pressed against said jaw when the screw is turned in said nut.

24. In a vise, a main frame, a nut in said frame, a movable frame including a jaw and a slide pivoted in said jaw, links attached to said slide, a screw supported in said links and adapted to engage said nut, and a rider on said screw, said rider being arranged to be pinched between opposed parts of the vise when the screw is turned in said nut in one direction and one of said links being arranged to be similarly pinched when the screw is turned in the nut in the other direction.

25. In a vise, a main frame and a movable frame including a pivoted slide, said slide being arranged to be pinched when the frames are in opposition whereby it is prevented from pivotal movement.

26. In a vise, a main frame having a fixed jaw, a movable frame including a-front jaw and a slide pivotally mounted in the front jaw, said front aw being arranged to bind said slide when the jaws are in opposition whereby said slide is prevented from pivotal movement.

27. In a vise, a main frame, a nut in said frame, a movable frame arranged in said main frame, and a screw in said movable frame adapted to engage said nut, said nut being formed with a longitudinal cleaning slot therein.

28. In a vise, a main frame, a movable frame arranged in said main frame, a nut divided longitudinally into two adjacent sections integral with said main frame and a screw in said movable frame adapted to engage said nut.

29. In a vise, a main frame, a nut in said frame having a longitudinal slot therein, a movable frame, and a screw arranged in said movable frame and adapted to be moved into and out of engagement with said nut, and means for locking said screw in said nut.

30. In a vise, a main frame, a nut in said frame, a movable frame including slides arranged in said main frame, a screw carried by said movable frame, and means operated by the oscillation of one of said slides for engaging and disengaging said screw and nut.

31. In a vise, a main frame, a nut in said frame, a slidable frame including a pivoted slide, a screw adapted to be moved into and out of said nut supported on said slide and means for supporting said screw out of engagement with said nut.

32. In a vise, a main frame, a nut in said frame, a slidable frame including a pivoted slide, a screw adapted to be moved into and out of said nut carried on said slide, and means for supporting said screw out of engagement with said nut, said screw being provided with a groove adapted to engage said means and release it from said screw.

33. In a vise, a main frame, a nut in said frame, a slidable frame including a pivoted slide, a screw adapted to be moved into and out of engagement with said nut carried on said slide, and a hook for supporting said screw out of engagement with said nut, said screw being provided with a groove having a substantially radial side.

34:. In a vise, a jaw provided with a socket and a recess communicating with said socket, a dog having a shank adapted to seat in said socket and to be adjustable therein, and means disposed in said recess adapted to frictionally engage said dog shank.

35. In a vise, a front-jaw provided with a socket and a recess communicating with said socket, a dog having a shank adapted to seat in said socket and to be adjustable therein, a spring disposed in said recess frictionally engaging said shank, and means for preventing the withdrawal of said dog shank from said socket.

36. In a vise, a jaw provided with a socket and a recess communicating with said socket, a dog having a shank adapted to engage said socket and to be revolubly and vertically adjustable therein, and a spring disposed in said recess in frictional contact with said shank.

37. In a vise, a jaw provided with a socket and a recess communicating with said socket, a dog having a shank adapted to engage said socket and to be revolubly and vertically adjustable therein, a spring disposed in said recess in frictional contact with said dog shank and means for retaining said spring in said recess. I

38. In a vise, a aw provided with a socket and a recess communicating with said socket, a dog having a shank adjustably arranged in said socket, a spring disposed in said recess in frictional engagement with said shank and a lining for said jaw adapted to retain said spring in said recess.

39. In a .vise, a jaw provided with two cylindrical sockets and a recess traversing bothof said sockets, a dog having a shank disposed in each of said sockets and adjustable therein, a spring disposed in said recess, and means for pressing said spring into said recess to frictionally engage both of said shanks.

40. In a vise, a jaw provided with two sockets and a recess communicating therewith, a dog having a shank adjustably disposed in each of said SOC.i 6tS, 2111Cl means arranged in said recess in frictional engagement with both of said dog shanks.

41. In a vise, a jaw provided with a socket and a recess in communication therewith, a dog shank having a reduced portion intermediate its ends adjustably arranged in said socket, a spring disposed in said recess to frictionally engage the reduced portion of said shank, and means for retaining said spring in said recess.

42. In a vise, a main frame, a nut in said frame, a movable frame including a pivoted slide arranged in said main frame, a screw carried by said movable frame adapted to engage said nut, a screw head for turning said screw, and means operated by the transverse shifting of said screw head for disengaging said screw and nut.

43-. In a vise, a movable jaw, a slide supporting said jaw and mounted therein to turn about the longitudinal axis of said slides.

44. In a vise, a mainframe, a front'jaw, and a slide supporting said front jawin said main frame and pivotally mounted in both said frame and said jaw.

45. In a vise, a main frame, a nut in said frame, a slidable frame arranged in said main frame, a screw adapted to be moved into and out of said nut supported on said slidable frame, and means for supporting said screw out of engagement with said nut, said screw being provided with a groove for disengaging said supporting-means. from the screw.

46. In a vise, a main frame, a nut in said frame, aslidable frame arranged in said main frame, a screw adapted to be moved into and out of said nut supported on said slidable frame, and a hook for supporting said screw out of engagement with said nut, said screw being'provided with a groove adapted to engage the point of said hook to release the hook from the screw.

In testimony whereof, I have hereunto set my hand at San Francisco, California, this 11th day of February, 1916.

CHARLES SUMNER EVANS.

In presence of H. G. PRosT. 3 

